LowPower library usage in Arduino - Mini Project: Build & Apply

Using the LowPower Library to Save Battery on Arduino

📖 Scenario: You are building a battery-powered Arduino project that needs to save power when it is not doing anything important. To do this, you will use the LowPower library to put the Arduino into sleep mode for a short time.

🎯 Goal: Learn how to use the LowPower library to put the Arduino into sleep mode for 8 seconds repeatedly, saving battery power.

📋 What You'll Learn

Include the LowPower library in your sketch

Use the LowPower.powerDown() function to put the Arduino to sleep

Set up a loop that sleeps for 8 seconds repeatedly

Print a message to the Serial Monitor after waking up

💡 Why This Matters

🌍 Real World

Battery-powered devices like sensors or remote controls need to save power by sleeping when idle.

💼 Career

Understanding power management is important for embedded systems engineers and IoT developers to extend device battery life.

1

Set up the Serial communication

Write void setup() function that starts Serial communication at 9600 baud with Serial.begin(9600); and write an empty void loop() function.

Arduino

void setup() {
  // Your code here
}

void loop() {
  // Your code here
}

Need a hint?

Use Serial.begin(9600); inside setup() to start serial communication.

2

Include the LowPower library

Add the line #include <LowPower.h> at the top of your sketch to include the LowPower library.

Arduino

#include 

void setup() {
  Serial.begin(9600);
}

void loop() {
  
  // Your code here
}

Need a hint?

Use #include <LowPower.h> to add the library.

3

Put Arduino to sleep for 8 seconds

Inside the loop() function, write the line LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); to put the Arduino to sleep for 8 seconds with ADC and BOD turned off.

Arduino

#include 

void setup() {
  Serial.begin(9600);
}

void loop() {
  // Put Arduino to sleep for 8 seconds
  // Your code here
}

Need a hint?

Use LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); inside loop().

4

Print a message after waking up

After the sleep line in loop(), write Serial.println("Woke up!"); to print the message each time the Arduino wakes up.

Arduino

#include 

void setup() {
  Serial.begin(9600);
}

void loop() {
  LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
  // Print wake up message
  // Your code here
}

Need a hint?

Use Serial.println("Woke up!"); after the sleep call.